Adhesive laminate and method for making retroreflective tape with the adhesive laminate

Abstract

Provided is an adhesive laminate and a method for making retroreflective tapes with the adhesive laminate. The adhesive laminate is coated and laminated on the conventional retroreflective substrate. The adhesive laminate comprises: a retroreflective substrate adhesive layer and a temporary carrier adhesive layer. The adhesive laminate may further comprise a cross-linking layer between the retroreflective substrate adhesive layer and the temporary carrier adhesive layer. The adhesive laminate has excellent adhesion to rubber articles. The conventional retroreflective substrate may be attached on the rubber articles firmly by the adhesive laminate. The adhesive laminate may not deform or be damaged during attachment process. The adhesive laminate also may not peel off from the rubber articles after use over time. Rubber articles with the adhesive laminate have lasting light-reflecting and alerting effects with enhanced safety.

What is claimed is: 
     
         1 . An adhesive laminate comprising:
 a retroreflective substrate adhesive layer having an adhesive surface and comprising resin and a solvent; and   a temporary carrier adhesive layer disposed on a surface of the retroreflective substrate adhesive layer opposite the adhesive surface and comprising a rubber adhesive.   
     
     
         2 . The adhesive laminate as claimed in  claim 1 , wherein at least one cross-linking layer is formed between the retroreflective substrate adhesive layer and the temporary carrier adhesive layer; the at least one cross-linking layer comprises: polyurethane (PU) and a rubber adhesive. 
     
     
         3 . The adhesive laminate as claimed in  claim 1 , wherein the resin is PU, acrylic, epoxy, or a combination thereof. 
     
     
         4 . The adhesive laminate as claimed in  claim 3 , wherein the PU is a PU adhesive; the PU adhesive comprises at least one diisocyanate, at least one polyisocyanate, at least one polyol, at least one product from unsaturated polyol, and at least one chain extender. 
     
     
         5 . The adhesive laminate as claimed in  claim 4 , wherein the at least one diisocyanate and the at least one polyisocyanate are respectively aliphatic isocyanate, alicyclic isocyanate, aromatic isocyanate, heterocyclic isocyanate, or a combination thereof; the at least one polyol is polycaprolactone (PCL) polyol, polycarbonate polyol, PU diol, polyester polyol, or a combination thereof; the at least one product from unsaturated polyol is hydroxyl-terminated polybutadiene (HTPB) material or hydroxyl-terminated butadiene acrylonitrile cooligomer liquid rubber; and the at least one chain extender is diol or triol. 
     
     
         6 . The adhesive laminate as claimed in  claim 1 , wherein the rubber adhesive comprises: a rubber component, a tackifier, a plasticizer, and an additive; and the additive is a vulcanizing agent or a silane coupling agent. 
     
     
         7 . The adhesive laminate as claimed in  claim 6 , wherein the rubber component is natural rubber, synthetic rubber, or a combination thereof; the synthetic rubber is chloroprene rubber (CR), styrene butadiene rubber (SBR), polybutadiene rubber (BR), nitrile butadiene rubber (NBR), isoprene rubber (IR), butyl rubber (IIR), ethylene propylene diene monomer rubber (EPDM), or a combination thereof; the tackifier is rosin ester, polymerized rosin, terpene, polyterpene, styrenated terpene, terpene phenolic, petroleum hydrocarbon, or a combination thereof; the plasticizer is mineral oil, polybutene (PB), isoprene rubber, or a combination thereof; the vulcanizing agent is sulfur or 4,4′-dithiodimorpholine; the silane coupling agent is triethoxyoctylsilane, 3-(glycidoxypropyl)methyldiethoxysilane, bis(triethoxy)silane derivative, or a combination thereof. 
     
     
         8 . The adhesive laminate as claimed in  claim 1 , wherein the retroreflective substrate adhesive layer further comprises ink. 
     
     
         9 . A method for making retroreflective tapes with an adhesive laminate as claimed in  claim 1  comprising:
 providing a retroreflective substrate; 
 coating the retroreflective substrate adhesive layer on a side of the retroreflective substrate; 
 coating the temporary carrier adhesive layer on another side of the retroreflective substrate opposite the retroreflective substrate adhesive layer; 
 pasting a temporary carrier on a side of the temporary carrier adhesive layer opposite the retroreflective substrate adhesive layer. 
 
     
     
         10 . The method for making retroreflective tapes with an adhesive laminate as claimed in  claim 9 , wherein at least one cross-linking layer is coated between the retroreflective substrate adhesive layer and the temporary carrier adhesive layer. 
     
     
         11 . The method for making retroreflective tapes with an adhesive laminate as claimed in  claim 9 , wherein the thickness of the retroreflective substrate adhesive layer ranges from 0.04 mm to 0.1 mm; the thickness of the temporary carrier adhesive layer ranges from 0.04 mm to 0.1 mm. 
     
     
         12 . The method for making retroreflective tapes with an adhesive laminate as claimed in  claim 10 , wherein the thickness of the cross-linking layer ranges from 0.04 mm to 0.15 mm.